The by-product in plant photosynthesis is? By: Sunday|Published on: Jun 8|Categories: Agricultural Science WAEC| 0 comments A. carbondioxide B. carbohydrate C. hydrogen D. oxygen Correct Answer: Option D – oxygen Users Also Read These:A small stem from a hibiscus plant was placed in a…Which of the following is considered to be the first…The by-product of photosynthesis is?Which of the these is not an excretory product of plant?The first stable product of photosynthesis is?SEE ALSO Which of the following processes in plants are directly affected by high temperatures?